The original Superchargers were rated at a max of 90 KiloWatts (KW) and the upgrade is to 120 KW. The Tesla Motors Supercharger page has descriptions that, frankly, are simplistic but get the idea across.

I'm pretty sure that spreadsheet is out of date. The Centralia Washington SC is 120 KW. I've heard the the Woodburn, OR is also 120KW.